Backlight and display apparatus

ABSTRACT

A backlight includes a light guide plate, an optical member, a frame, and an adhesive agent. The optical member is disposed to face the light guide plate. The optical member has a sheet-like shape. The frame is configured to enclose the light guide plate and the optical member. The adhesive agent is disposed in a first hole of the frame and in a space which communicates with the first hole and includes a cutout or a hole of each of the light guide plate and the optical member. The adhesive agent is configured to fix the light guide plate and the optical member.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to a backlight, and a display apparatusincluding the backlight.

Description of the Background Art

A backlight in which a middle frame and a rear frame are fitted togetherin a state in which optical sheets, a light guide plate, and areflection plate are accommodated in the rear frame has been known.Also, a display apparatus including the backlight, a display panel, anda front frame has been known. The following problems have hitherto beenpresent. When the display apparatus as described above is vibrated,internal members of the backlight such as the optical sheets move withrespect to external members of the backlight such as the frames,generating sound due to contact of the members, and causing damage tothe members.

To solve the problems as described above, for example, in the relatedtechnologies such as Japanese Patent Application Laid-Open No.2011-103221 and Japanese Patent Application Laid-Open No. 2013-171723,optical sheets, a light guide plate, and a reflection sheet are fixed bydouble-sided adhesive tapes, and movement of internal members is therebyrestricted.

However, the configuration in Which many double-sided adhesive tapes areused as in the related display apparatus has problems of increase in thecosts of the tape itself, as well as the manufacturing costs due toattachment operation.

SUMMARY

The present invention has been made in view of the problems as describedabove, and has an object to provide a technology that can fix a lightguide plate and an optical member inside a backlight, with reduced useof tapes.

The present invention is intended for a backlight. The backlightincludes a light guide plate, an optical member, and a frame. Theoptical member is disposed to face the light guide plate. The opticalmember has a sheet-like shape. The frame is configured to enclose thelight guide plate and the optical member. A first hole is provided topass through the frame in a direction in which the light guide plate andthe optical member face each other. A cutout or a hole aligned to aposition of the first hole of the frame is provided in each of the lightguide plate and the optical member. The backlight further includes anadhesive agent. The adhesive agent is disposed in the first hole of theframe and in a space which communicates with the first hole and includesthe cutout or the hole of each of the light guide plate and the opticalmember. The adhesive agent is configured to fix the light guide plateand the optical member.

The light guide plate and the optical member inside the backlight can befixed, with reduced use of tapes.

These and other objects, features, aspects and advantages of the presentinvention will become more apparent from the following detaileddescription of the present invention when taken in conjunction with theaccompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded perspective view illustrating a configuration of adisplay apparatus according to a first embodiment.

FIG. 2 is a perspective view illustrating a configuration of a displaypanel according to the first embodiment.

FIG. 3 is a plan view of a configuration of the display apparatusaccording to the first embodiment, as seen from a back surface.

FIG. 4 is a cross-sectional view illustrating a configuration of a partof the display apparatus according to the first embodiment.

FIG. 5 is an exploded perspective view illustrating a configuration of apart of the display apparatus according to the first embodiment.

FIG. 6 is a plan view illustrating cutouts according to the firstembodiment.

FIG. 7 is a cross-sectional view illustrating a configuration of a partof the display apparatus according to a first modification of the firstembodiment.

FIG. 8 is a plan view of a configuration of the display apparatus of asecond embodiment, as seen from a back surface.

FIG. 9 is a cross-sectional view illustrating a configuration of a partof the display apparatus according to the second embodiment.

FIG. 10 is a cross-sectional view illustrating a configuration of a partof the display apparatus according to a third modification of the firstand second embodiments.

FIG. 11 is a cross-sectional view illustrating a configuration of a partof the display apparatus according to a fourth modification of the firstand second embodiments.

FIG. 12 is a cross-sectional view illustrating a configuration of a partof the display apparatus according to a fifth modification of the firstand second embodiments.

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment OverallConfiguration of Display Apparatus

FIG. 1 is an exploded perspective view illustrating a display apparatus100 according to a first embodiment of the present invention. Thedisplay apparatus 100 of FIG. 1 includes a display panel 1, a backlight2, a front frame 3, and a circuit substrate 4.

The display panel 1 is disposed to face the backlight 2. The backlight 2irradiates a back surface of the display panel 1 with light. The frontframe 3 covers at least a part of a frame (described later) of thebacklight 2, in a state in Which the front frame 3 and the backlight 2interpose the display panel 1. The front frame 3 includes an openingportion on an emission surface of light of the backlight 2. The circuitsubstrate 4 controls the display panel 1 and the light source 26, forexample, with electric signals.

Note that, although illustration is omitted, a touch panel for detectinga touch position of touch operation on a screen, and a substantiallytransparent protective member for protecting the touch panel may beprovided on a front surface of the display panel 1. Further, a cover forprotecting the circuit substrate ay be provided on a back surface of thedisplay panel 1.

Next, components of the display apparatus 100 according to the firstembodiment will be described in detail.

Display Panel

FIG. 2 is a perspective view illustrating a configuration of the displaypanel 1. For example, the display panel 1 is a transmission-type or asemi-transmission-type liquid crystal display panel utilizingbirefringence of liquid crystals. The display panel 1 of FIG. 2 includesa first substrate 11 and a second substrate 12. Although illustration isomitted, the first substrate 11 includes an insulated substrate such asglass, a color filter (CF), a light blocking layer, and a counterelectrode. The CF, the light blocking lay and the counter electrode aredisposed on the insulated substrate. Although illustration is omitted,the second substrate 12 includes an insulated substrate such as glass, athin film transistor (TFT) serving as a switching element, and a pixelelectrode. The TFT and the pixel electrode are disposed on the insulatedsubstrate.

Although illustration is omitted, the display panel 1 further includesspacers for maintaining an interval between the first substrate 11 andthe second substrate 12, a sealing agent for attaching together thefirst substrate 11 and the second substrate 12, liquid crystals heldbetween the first substrate 11 the second substrate 12, a sealing agentfor an injection opening through which the liquid crystals are injected,and an alignment film for aligning the liquid crystals. The displaypanel 1 further includes a first polarizing plate 111 disposed on anouter side surface of the first substrate 11, a second polarizing plate(not shown) disposed on an outer side surface of the second substrate12, and a drive integrated circuit (IC) 13. The drive IC 13 is disposedon an outer peripheral portion of the second substrate 12, or isdisposed on a tape-like wiring material, such as a tape carrier package(TCP) and a chip on film (COF), that is connected to an outer peripheralportion of the second substrate 12.

Backlight

The backlight 2 emits light from the second substrate 12 side, whichfaces a side opposite to a display surface (front surface) of thedisplay panel 1. The backlight 2 of FIG. 1 includes a light source 26, alight guide plate 23, sheet-like optical members, frames, and anadhesive agent 28.

The light source 26 emits light. The light guide plate 23 includes aside surface being an incident surface through which light emitted fromthe light source 26 enters, a front surface being an emission surfacethrough which light that has entered through the incident surface andpropagated is emitted, and a back surface being a counter emissionsurface.

The optical members of the backlight 2 are disposed to face the lightguide plate 23. The optical members according to the first embodimentinclude optical sheets 22 disposed to face the emission surface of thelight guide plate 23, and a reflection plate 24 disposed to face thecounter emission surface of the light guide plate 23. The optical sheets22 control distribution and diffusion of light emitted from the lightguide plate 23. The reflection plate 24 reflects light emitted front thelight guide plate 23 to cause the light to enter the light guide plate23.

The frames of the backlight 2 enclose the light guide plate 23, theoptical sheets 22, and the reflection plate 24. The frames according tothe first embodiment de a middle frame 21 and a rear frame 25. The rearframe 25 covers a surface of the light guide plate 23 on the oppositeside of an emission surface, i.e., the counter emission surface, andholds the light guide plate 23, the optical sheets 22, and thereflection plate 24, for example. The middle frame 21 covers an endportion of the emission surface of the light guide plate 23, and holdsthe light guide plate 23, the optical sheets 22, and the reflectionplate 24, for example.

Light Guide Plate

The light guide plate 23 is made of transparent acrylic resin,polycarbonate resin, or glass, for example. At least any of the counteremission surface and the emission surface of the light guide plate 23 isprovided with at least any of a scattering dot pattern and a prism shapefor causing light to be emitted and for adjusting intensity distributionand an emission direction of in-plane light.

Optical Sheet

On the light guide plate 23, the optical sheets 22 for adjustingintensity distribution and an emission angle of emission light of thelight guide plate 23 are disposed. As the optical sheets 22, forexample, a necessary number of sheets of a type depending on purposesare used, out of a lens sheet intended for the purpose of concentratinglight, a diffusion sheet intended for the purpose of making lightuniform, and a viewing angle-adjustable sheet for adjusting luminance ina viewing angle direction. As the material for the optical sheets 22,for example, a resin material such as polycarbonate (PC) and polyethylene terephthalate (PET) is used.

Middle Frame

The Middle frame 21 includes an opening portion for causing light fromthe emission surface of the light guide plate 23 to be emitted to theoutside of the backlight 2. A projecting portion is provided on a frontsurface near the opening portion of the middle frame 21. The displaypanel 1 is mounted and held on the front surface of the middle frame 21in a state in which the display panel 1 is positioned by the projectingportion. As the material for the middle frame 21, for example, metalsuch as aluminum, stainless steel, and iron, or a resin material such aspolycarbonate (PC) and acrylonitrile butadiene styrene (ABS) is used.

Reflection Plate

The reflection plate 24 for reflecting light emitted from the counteremission surface of the light guide plate 23 toward the emission surfaceside is disposed below the light guide plate 23. As the material for thereflection plate 24, for example, a resin material such as poly ethyleneterephthalate (PET) is used.

Rear Frame

It is desirable that metal having high thermal conductivity be used asthe material for the rear frame 25, so that heat released from the lightsource 26 can be conducted and efficiently dissipated to the outside.Particularly, if a housing made of an aluminum or aluminum alloy havinghigh thermal conductivity is used for the rear frame 25, heat from thelight source 26 can be efficiently dissipated, and heat can be lessliable to remain in the backlight 2.

The middle frame 21 and the rear frame 25 are generally fixed to eachother with a hook catching structure or screw fastening, and therebyholds other components of the backlight 2, the display panel 1, and thecircuit substrate 4, for example. Note that, as the middle frame 21 andthe rear frame 25, a single member integrating both the frames may beused, instead of separate members individually prepared for theseframes.

Light Source

As the light source 26, for example, point light sources such as lightemitting diodes (LEDs) of three primary colors of light including red,green, and blue (RGB), point light sources of emitting colors other thanRGB, or fluorescent lamps are used. In the configuration in which pointlight sources are used as the light source 26, a light source substrateon which the point light sources are mounted may include a general glassepoxy resin as a base, or may include a flexible flat cable.Alternatively, to enhance heat dissipation performance, the light sourcesubstrate may include metal such as aluminum or ceramics as a base. Thelight source substrate is held by being attached to a side surface ofthe light guide plate 23, or an inner side surface of the rear frame 25,for example.

Front Frame

The front frame 3 is a frame-like member that holds the display panel 1and the backlight 2. For example, the front frame 3 is made of a thinplate-like metal molded product or resin molded product, and is fixed tothe backlight 2 with a hook-like fixing structure, screw fastening, orthe like. The front frame 3 may be made of a single member, or may bemade of a combination of a plurality of members. Further, an attachmentportion (for example, a screw or an attachment hole) to be attached tothe final product may be provided in a side surface, a front surface, aback surface, a peripheral portion, or the like of the front frame 3.

Circuit Substrate

The circuit substrate 4 controls the display panel 1 and the lightsource 26 with input and output signals being electric signals. Usually,electrical components of the circuit substrate 4 are mounted on aflexible printed circuit (FPC) that is connected to the display panel 1and that has a configuration in which wiring is disposed on a basematerial of a film, but this is not restrictive. For example, theelectrical components of the circuit substrate 4 may be mounted,disposed, and, fixed on a surface of a copper pattern joined to glassepoxy or the like by solder, mainly on a back surface side (side onwhich light of the backlight 2 is not emitted) of the display apparatus100.

Further, to protect the circuit substrate 4 from external pressure andstatic electricity, the circuit substrate 4 may be covered by aprotective cover (not shown) made of metal such as aluminum, stainlesssteel, a zinc-plated sheet steel, or a film-like thin resin made ofpolyethylene terephthalate (PET) or the like. In the configuration inwhich a metal protective cover is provided, it is desirable that a resinsheet made of PET or the like be attached to the circuit substrate 4,for the sake of securing insulation to avoid unintended electricalcontact between the circuit substrate 4 and the electrical components onthe circuit substrate 4 and the outside.

Cutout

FIG. 3 is a plan view of a configuration of the display apparatus 100according to the first embodiment, as seen from the back surface. FIG. 4is a cross-sectional view taken along the cross-sectional line A-A ofFIG. 3. FIG. 5 is an exploded perspective view illustrating aconfiguration near the cross-sectional line A-A of the display apparatus100.

As illustrated in FIG. 3, in the first embodiment, at least one firsthole 251 is provided in a surface of the rear frame 25 on an oppositeside of the display surface side of the display apparatus 100. The firsthole 251 passes through the rear frame 25 in a direction in which thelight guide plate 23 and the optical sheets 22 and the reflection plate24 face each other. It is desirable that the first hole 251 be providedin a portion that does not affect display of the display apparatus 100,for example, a portion outside of a display area of the display panel 1.

As illustrated in the exploded perspective view of FIG. 5, an endportion of each of the light guide plate 23, the optical sheets 22, andthe reflection plate 24 includes a projecting portion 7 projectingtoward a side and being fitted into a recessed portion 8 provided on aninner side surface of the middle frame 21. Further, the projectingportion 7 of each of the light guide plate 23, the optical sheets 22,and the reflection plate 24 is provided with a cutout 6. FIG. 6 is aplan view illustrating the cutout 6 provided in each of the light guideplate 23, the optical sheets 22, and the reflection plate 24. In thefirst embodiment, the cutout 6 of each of the light guide plate 23, theoptical sheets 22, and the reflection plate 24 has the same shape, butmay have slightly different shapes.

As illustrated in FIG. 4 and FIG. 5, the cutout 6 of each of the lightguide plate 23, the optical sheets 22, and the reflection plate 24 isaligned to the position of the first hole 251 of the rear frame 25. Inthe first embodiment, the position of the center of the cutout 6 of eachof the light guide plate 23, the optical sheets 22, and the reflectionplate 24 is aligned to the position of the center of the first hole 251of the rear frame 25, but may be slightly shifted as long as the spaceis maintained and the space communicates with the first hole 251. Inthis manner, the space that communicates the first hole 251 and includesthe cutout 6 of each of the light guide plate 23, the optical sheets 22,and the reflection plate 24 can be provided inside the frame.

Note that it is desirable that the cutouts 6 be provided in a portionthat does not affect display of the display apparatus 100, for example,a portion outside of the display area of the display panel 1, such asthe projecting portion 7. Further, instead of the cutout 6, a circularhole similar to the first hole 251 of the rear frame 25 may be providedin each of the light wide plate 23, the optical sheets 22, and thereflection plate 24.

Adhesive Agent

As illustrated in FIG. 4, the adhesive agent 28 is injected and loadedinto the space through, the first hole 251 of the rear frame 25, and isthereby filled in the first hole 251 and the space. The adhesive agent28 configured as described above fixes the light guide plate 23, theoptical sheets 22, and the reflection plate 24.

The adhesive agent 28 absorbs moisture in air, and gradually cures overtime. As the adhesive agent 28, a thermosetting or UV-curable adhesiveagent, a two-liquid mixing adhesive agent can be used, other thangeneral adhesive agents. Thus, an adhesive agent to be used as theadhesive agent 28 may be appropriately selected depending oncharacteristics required for the display apparatus 100.

Note that it is desirable that an adhesive agent having viscosity of50000 mPa·sec or more and 300000 mPa·sec or less be used as the adhesiveagent 28, so that the injected adhesive agent 28 does not enter anunintended gap between members of the display apparatus 100. In thefirst embodiment, by providing the cutouts 6 in the projecting portion 7that can be fitted into the recessed portion 8 of the middle frame 21 asin FIG. 5, the adhesive agent 28 can be arranged not to enter anunintended gap between members of the display apparatus 100.

With the above configuration, the middle frame 21, the optical sheets22, the light guide plate 23, the reflection plate 24, and the rearframe 25 are integrally fixed by the adhesive agent 28. In this manner,movement of each member is restricted by the adhesive agent 28.Accordingly, even if vibration is applied to the display apparatus 100,movement of the optical sheets 22, the light guide plate 23, and thereflection plate 24 in a plan direction is restricted. Thus, collisionsound between these components and other members such as the rear frame25 and the middle frame 21, and damage to these components can be lessliable to be caused.

Overview of First Embodiment

According to the first embodiment as described above, the adhesive agent28 is disposed in the first hole 251 of the rear frame 25 and in thespace that communicates with the first hole 251 and includes the cutout6 of each of the light guide plate 23, the optical sheets 22, and thereflection plate 24, and fixes the optical sheets 22 and the reflectionplate 24. According to such a configuration, even if vibration isapplied to the display apparatus 100, movement of internal members ofthe backlight 2 with respect to external members can be restricted.Further, such a configuration can be implemented by at least oneinjection of the adhesive agent 28 such as resin, not by using manydouble-sided tapes. Thus, costs can be reduced. Note that, withappropriate use of double-sided tapes, internal members can be moresecurely fixed.

First Modification

FIG. 7 is a cross-sectional view illustrating a configuration of a partof the display apparatus 100 according to the first modification. InFIG. 7, a projection length of an end portion of the optical sheet 22farthest from the light guide plate 23 from an end portion of the lightguide plate 23 is larger than a projection length of an end portion ofthe optical sheet 22 closest to the light guide plate 23 from the endportion of the light guide plate 23. Further, an end portion of thereflection plate 24 projects from the end portion of the light guideplate 23. According to such a configuration, a contact area between theoptical sheets 22 and the light guide plate 23 and the adhesive agent 28is increased, and thus the adhesive agent 28 can securely fix theoptical sheets 22 and the light guide plate 3. Note that the firstmodification can also be similarly applied to a second embodiment to bedescribed later.

Second Modification

In the first embodiment, the cutouts 6 are provided in all of theoptical sheets 22, the light guide plate 23, and the reflection plate24, but this is not restrictive. For example, the cutouts 6 may beprovided in the light guide plate 23 and the reflection plate 24 withoutproviding the cutouts 6 in the optical sheets 22, and the light guideplate 23 and the reflection plate 24 may be fixed with the adhesiveagent 28. Further, a plurality of first holes 251, instead of a singlefirst hole 251, may be provided as long as the display area of thedisplay panel 1 is not affected. Further, by providing a plurality ofcutouts 6 corresponding to the plurality of first holes 251, a space inwhich the adhesive agent 28 is filled inside the frame may be increased.Note that the second modification can also be similarly applied to asecond embodiment to be described later.

Second Embodiment

FIG. 8 is a plan view of a configuration of the display apparatus 100according to a second embodiment of the present invention, as seen fromthe front surface. FIG. 9 is a cross-sectional view taken along thecross-sectional line B-B of FIG. 8. In the following, of the componentsaccording to the second embodiment, components that are the same as orsimilar to the above components are denoted by the same reference signs,and different components will be mainly described.

In the first embodiment, at least one first hole 251 is provided in therear frame 25, the cutouts 6 being included by the space communicatingwith the first hole 251 are provided in the optical sheets 22, the lightguide plate 23, and the reflection plate 24, and the adhesive agent 28is injected and loaded into the space through the first hole 251.

In contrast, in the second embodiment, as illustrated in FIG. 9, insteadof the first hole 251, at least one first hole 211 is provided in afront surface of the middle frame 21, and the cutouts 6 being includedby a space communicating with the first hole 211 are provided in theoptical sheets 22, the light guide plate 23, and the reflection plate24. Further, as illustrated in FIG. 8 and FIG. 9, a second hole 31communicating with the first hole 211 of the middle frame 21 is providedin the front frame 3. Further, as illustrated in FIG. 9, the adhesiveagent 28 is injected and loaded into the first hole 211 and the spacethrough the second hole 31 of the front frame 3, and is thereby filledin the first hole 211, the second hole 31, and the space. The adhesiveagent 28 configured as described above fixes the light guide plate 23,the optical sheets 22, and the reflection plate 24.

Note that, if the adhesive agent 28 is transparent, light of the lightsource 26 may leak to the outside of the display apparatus 100 throughthe adhesive agent 28 inside the first hole 211 and the second hole 31.In this case, as illustrated in FIG. 8 and FIG. 9, in the configurationin which the second hole 31 is provided in the front surface of thedisplay apparatus 100, a user may visually recognize the light leakagewhen the user observes display of the display apparatus 100. To reducethe leakage, the use of a black adhesive agent as the adhesive agent 28,or covering the second hole 31 with a light-blocking tape or the like iseffective.

Overview of Second Embodiment

According to the second embodiment as described above, the adhesiveagent 28 is disposed in the first hole 211 of the middle frame 21, thesecond hole 31 of the front frame 3, and the space including the cutout6 of each of the light guide plate 23, the optical sheets 22, and thereflection plate 24, and collectively fixes internal members from therear frame 25 to the front frame 3. According to such a configuration,even if vibration is applied to the display apparatus 100, movement ofinternal members of the display apparatus 100 with respect to externalmembers can be restricted. Further, such a configuration can beimplemented by at least one injection of the adhesive agent 28 such asresin, not by using many double-sided tapes. Thus, costs can be reduced.Note that, with appropriate use of double-sided tapes, internal memberscan be more securely fixed.

Third Modification

FIG. 10 is a cross-sectional view illustrating a configuration of a partof the display apparatus 100 according to the third modification. In thethird modification, at least one first hole 251 is provided in a sidesurface of the rear frame 25. Further, a second hole 31 communicatingwith the first hole 251 of the rear frame 25 is provided in the frontframe 3. Further, the adhesive agent 28 is injected and loaded into thespace through the second hole 31 of the front frame 3, and is therebyfilled in the first hole 251, the second hole 31, and the space. Theadhesive agent 28 configured as described above fixes the light guideplate 23, the optical sheets 22, and the reflection plate 24. Thus,effects similar to those of the first and second embodiments can beobtained.

Note that, in the configuration of FIG. 10, another first hole (notshown) communicating with the first hole 251 of the rear frame 25 may beprovided in the middle frame 21.

Fourth Modification

FIG. 11 is a cross-sectional view illustrating a configuration of a partof the display apparatus 100 according to the fourth modification. Aconfiguration of the fourth modification is the same as theconfiguration of the second embodiment (FIG. 9), except that the displaypanel 1 comes in contact with the adhesive agent 28. Specifically, inthe fourth modification, the adhesive agent 28 fixes not only the lightguide plate 23, the optical sheets 22, and the reflection plate 24, butalso fixes the display panel 1. According to such a configuration, tapesor the like for fixing the middle frame 21 and the display panel 1 canbe omitted. Note that the fourth modification can also be similarlyapplied to the first embodiment described above.

Fifth Modification

FIG. 12 is a cross-sectional view illustrating a configuration of a partof the display apparatus 100 according to the fifth modification. Aconfiguration of the fifth modification is the same as the configurationof the second embodiment (FIG. 9), except that the second hole 31 of thefront frame 3 is not provided. Note that the configuration of FIG. 12 ismanufactured by attaching the front frame 3 to the backlight 2 after theadhesive agent 28 is filled. According to such a configuration, even ifthe adhesive agent 28 is transparent, light of the light source 26 isless liable to leak to the outside of the display apparatus 100 throughthe adhesive agent 28 inside the first hole 211.

Note that, in the present invention, each embodiment can be freelycombined with each other, and each embodiment can be modified or omittedas appropriate, within the scope of the invention.

While the invention has been shown and described in detail, theforegoing description is in all aspects illustrative and notrestrictive. It is therefore understood that numerous modifications andvariations can be devised without departing from the scope of theinvention.

What is claimed is:
 1. A backlight comprising: a light guide platehaving a first main surface being an emission surface and a second mainsurface that is opposite to the first main surface; an optical memberdisposed to face the light guide plate, the optical member having asheet-like shape; and a frame configured to enclose the light guideplate and the optical member, the frame including a rear frame providedon a side of the light guide plate corresponding to the second mainsurface, a front frame provided on a side of the light guide platecorresponding to the first main surface, and a middle frame providedbetween the rear frame and the front frame and disposed on a portion ofthe optical member, wherein a first hole is provided to pass through theframe in a direction in which the light guide plate and the opticalmember face each other, a cutout or a hole aligned to a position of thefirst hole of the frame is provided in each of the light guide plate andthe optical member, and the backlight further comprises an adhesiveagent, the adhesive agent being disposed in the first hole of the frameand in a space which communicates with the first hole and includes thecutout or the hole of each of the light guide plate and the opticalmember, the adhesive agent being configured to fix the light guide plateand the optical member.
 2. The backlight according to claim 1, whereinthe rear frame is configured to cover the second main surface of thelight guide plate, and the first hole of the frame is provided in atleast one of the rear frame and the middle frame.
 3. A display apparatuscomprising: the backlight according to claim 1; and a display paneldisposed to face the backlight.
 4. The display apparatus according toclaim 3, wherein the front frame is configured to cover at least a partof the rear frame and middle frame of the backlight, in a state in whichthe display panel is interposed between the front frame and thebacklight, a second hole is provided in the front frame to communicatewith the first hole, and the adhesive agent is also disposed in thesecond hole of the front frame.
 5. The display apparatus according toclaim 3, wherein the adhesive agent fixes not only the light guide plateand the optical member, but also fixes the display panel.
 6. A displayapparatus comprising: the backlight according to claim 1; and a displaypanel disposed to face the backlight, wherein the display panel comes incontact with the adhesive agent.
 7. The backlight according to claim 1,further comprising a recessed portion provided on an inner side surfaceof the frame, wherein the light guide plate and the optical memberinclude a projecting portion that is fitted into the recessed portionand that includes the cutout or the hole.